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A study was conducted to investigate the effects of sleeping 8 hours per night and caffeine use on perceived energy levels. Subjects were categorized by

A study was conducted to investigate the effects of sleeping 8 hours per night and caffeine use on perceived energy levels. Subjects were categorized by their sleeping habits and by whether or not they used caffeine. Average energy score (as rated on a 10 point scale) by each group were calculated and are summarized in the table below:

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Slept 8 Hours? Caffeine Use? Average Energy Score Yes Yes 9.2 No 8.1 No Yes 8.7 No 5.4

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